Method and subscriber unit for performing power control

• US 7,706,332 B2
• Filed: 07/14/2005
• Issued: 04/27/2010
• Est. Priority Date: 06/30/1995
• Status: Expired due to Fees

• Current Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Original Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Inventors: Ozluturk, Fatih, Lomp, Gary
• Primary Examiner(s): Trost, IV; William
• Assistant Examiner(s): Chriss; Andrew
• Application Number:
  US11/181,450
• Publication Number:
  US 20050265430A1
• Time in Patent Office: 1,748 Days
• Field of Search: 370/335
• US Class Current: 370/335
• CPC Class Codes: G06F 13/374 using a self-select method with individual priority code comparator
• CPC Class Codes: H03H 17/0226 comprising look-up tables
• CPC Class Codes: H03H 17/06 Non-recursive filters
• CPC Class Codes: H03H 21/0018 Matched filters
• CPC Class Codes: H03H 2218/06 Multiple-input, multiple-output [MIMO]; Multiple-input, single-output [MISO]
• CPC Class Codes: H04B 1/7075 with code phase acquisition
• CPC Class Codes: H04B 1/70752 Partial correlation
• CPC Class Codes: H04B 1/70753 Partial phase search
• CPC Class Codes: H04B 1/70755 Setting of lock conditions, e.g. threshold
• CPC Class Codes: H04B 1/70758 Multimode search, i.e. using multiple search strategies
• CPC Class Codes: H04B 1/708 Parallel implementation
• CPC Class Codes: H04B 1/7085 using a code tracking loop, e.g. a delay-locked loop
• CPC Class Codes: H04B 1/7093 Matched filter type
• CPC Class Codes: H04B 1/7115 Constructive combining of multi-path signals, i.e. RAKE receivers
• CPC Class Codes: H04B 1/712 Weighting of fingers for combining, e.g. amplitude control or phase rotation using an inner loop
• CPC Class Codes: H04B 2201/70701 featuring pilot assisted reception
• CPC Class Codes: H04B 2201/70702 Intercell-related aspects
• CPC Class Codes: H04B 2201/70703 using multiple or variable rates
• CPC Class Codes: H04B 2201/70707 Efficiency-related aspects
• CPC Class Codes: H04B 2201/7071 with dynamic control of receiver resources
• CPC Class Codes: H04B 7/2628 : using code-division multiple access [CDMA] or spread spectrum multiple access [SSMA] H04B7/2618 takes precedence
• CPC Class Codes: H04B 7/2637 : for logical channel control
• CPC Class Codes: H04B 7/264 : for data rate control
• CPC Class Codes: H04J 13/004 : Orthogonal
• CPC Class Codes: H04J 13/10 : Code generation
• CPC Class Codes: H04J 13/107 : by concatenation
• CPC Class Codes: H04L 1/004 : by using forward error control H04L1/0618 takes precedence; coding, decoding or code conversion, for error detection or correction H03M13/00
• CPC Class Codes: H04L 2027/003 : at baseband only
• CPC Class Codes: H04L 2027/0053 : Closed loops
• CPC Class Codes: H04L 25/0212 : of impulse response
• CPC Class Codes: H04L 27/206 : using a pair of orthogonal carriers, e.g. quadrature carriers
• CPC Class Codes: H04L 27/2332 : using a non-coherent carrier
• CPC Class Codes: H04L 5/1446 : of transmission speed
• CPC Class Codes: H04W 52/08 : Closed loop power control
• CPC Class Codes: H04W 52/146 : Uplink power control
• CPC Class Codes: H04W 52/24 : using SIR [Signal to Interference Ratio] or other wireless path parameters
• CPC Class Codes: H04W 52/26 : using transmission rate or quality of service QoS [Quality of Service]
• CPC Class Codes: H04W 52/322 : Power control of broadcast channels
• CPC Class Codes: H04W 52/325 : Power control of control or pilot channels
• CPC Class Codes: H04W 52/343 : taking into account loading or congestion level
• CPC Class Codes: H04W 52/36 : with a discrete range or set of values, e.g. step size, ramping or offsets
• CPC Class Codes: H04W 52/367 : Power values between minimum and maximum limits, e.g. dynamic range
• CPC Class Codes: H04W 52/44 : in connection with interruption of transmission
• CPC Class Codes: H04W 52/50 : at the moment of starting communication in a multiple access environment
• CPC Class Codes: H04W 52/52 : using AGC [Automatic Gain Control] circuits or amplifiers
• CPC Class Codes: H04W 52/54 : Signalisation aspects of the TPC commands, e.g. frame structure
• CPC Class Codes: H04W 52/60 : using different transmission rates for TPC commands
• CPC Class Codes: Y02D 10/00 : Energy efficient computing, e.g. low power processors, power management or thermal management

Abstract

A system for rapidly acquiring a spreading code, used in a code division multiple access (CDMA) system, comprises a generator for generating a first long code and a second long code, with each long code having a length of N chips. The first long code is different from the second long code. A transmitter transmits the first long code and the second long code at a first phase angle and at a second phase angle, respectively, on a carrier signal over a communications channel using radio waves. The first long code and the second long code may be transmitted at an in-phase (I) angle and at a quadrature-phase (Q) angle, respectively, on the carrier signal. From the communications channel, an I acquisition circuit and a Q acquisition circuit may acquire, in parallel, the first long code and the second long code from the I angle and the Q angle, respectively, of the carrier signal by searching, in parallel, N/2 chips of the first long code and the second long code.

Claims

1. A code division multiple access subscriber unit comprising:

a circuit, operatively coupled to an antenna configured to generate power control bits which are included on only one of an in-phase (I) channel or a quadrature (Q) channel; and

the antenna configured to output a radio frequency signal derived at least in part from the I and Q channels.

2. A code division multiple access subscriber unit in accordance with claim 1, wherein the circuit is further configured to combine the I and Q channels with a complex sequence.

3. A code division multiple access subscriber unit in accordance with claim 2, wherein the combining is by multiplication.

4. A code division multiple access subscriber unit in accordance with claim 2, wherein the complex sequence comprises at least two pseudo noise sequences.

5. A code division multiple access subscriber unit in accordance with claim 1, wherein an other of the I and Q channels not including the power control bits further includes signaling information.

6. A code division multiple access subscriber unit in accordance with claim 1 wherein the circuit is further configured to generate a plurality of traffic channels;

wherein the radio frequency signal is derived at least in part from the plurality of traffic channels and at least two of the plurality of traffic channels have differing data rates.

7. A code division multiple access subscriber unit in accordance with claim 1, wherein the circuit is further configured to generate pilot bits;

wherein the radio frequency signal is derived at least in part from the pilot bits.

8. A code division multiple access subscriber unit, comprising:

an antenna configured to receive a first radio frequency signal;

a circuit, operatively coupled to the antenna, configured to generate power control bits in response to the first radio frequency signal, wherein the circuit is further configured to establish an in-phase (I) pre-spread channel and a quadrature (Q) baseband channel, such that the power control bits are included on only one of the I pre-spread channel or the Q baseband channel;

wherein a second radio frequency signal output by the code division multiple access subscriber unit includes the I and Q pre-spread channels.

9. A code division multiple access subscriber unit in accordance with claim 8 wherein the circuit is further configured to combine the I and Q pre-spread channels with a complex sequence.

10. A code division multiple access subscriber unit in accordance with claim 9, wherein the combining is by multiplication.

11. A code division multiple access subscriber unit in accordance with claim 9, wherein the complex sequence comprises at least two pseudo noise sequences.

12. A code division multiple access subscriber unit in accordance with claim 8 wherein the one of the I and Q pre-spread channels not including the power control bits further includes signaling information.

13. A code division multiple access subscriber unit in accordance with claim 8 wherein the circuit is further configured to generate a plurality of traffic channels;

wherein the radio is frequency signal is derived at least in part from the plurality of traffic channels and at least two of the plurality of traffic channels have differing data rates.

14. A code division multiple access subscriber unit in accordance with claim 8, wherein pilot bits are included in at least one of the I and the Q pre-spread channels.

15. A method for use in a code division multiple access (CDMA) subscriber unit, the method comprising:

receiving, by the CDMA subscriber unit, a first radio frequency signal;

generating power control bits in response to the first radio frequency signal;

producing an in phase (I) channel and a quadrature (Q) channel, wherein only one of the I channel or the Q channel includes the power control bits;

producing a second radio frequency signal including an I component and a Q component derived from the I channel and the Q channel; and

transmitting the second radio frequency signal.

16. A method in accordance with claim 15, further comprising combining the I and Q channels with a complex sequence.

17. A method in accordance with claim 16, wherein the complex sequence comprises at least two pseudo noise sequences.

18. A method in accordance with claim 15, further comprising supplying signaling information to the one of the I and Q channels including the power control bits.

19. A method in accordance with claim 15, further comprising generating a plurality of traffic channels;

wherein the second radio frequency signal including the I and Q components is derived from the plurality of traffic channels and at least two of the plurality of traffic channels have differing data rates.

20. A method in accordance with claim 15, further comprising producing pilot bits, wherein the second radio frequency signal including the I and Q components are derived from the produced pilot bits.

21. A code division multiple access subscriber unit comprising:

circuitry configured to receive a first radio frequency signal and generate power control bits in response to the first radio frequency signal;

wherein the power control bits are used to control a power of a base station;

wherein the circuitry is further configured to produce an in-phase (I) channel and a quadrature (Q) channel;

wherein only one of the I channel or the Q channel includes the power control bits;

wherein the circuitry is further configured to produce a second radio frequency signal including an I component and a Q component derived from the I channel and the Q channel;

wherein the circuitry is further configured to transmit the second radio frequency signal.

22. A code division multiple access subscriber unit in accordance with claim 21, wherein the circuitry is further configured to combine the I and Q channels with a complex sequence.

23. A code division multiple access subscriber unit in accordance with claim 22 wherein the combining is performed by multiplication.

24. A code division multiple access subscriber unit in accordance with claim 22, wherein the complex sequence comprises at least two pseudo noise sequences.

25. A code division multiple access subscriber unit in accordance with claim 21, wherein the circutry is further configured to supply signaling information to the one of the I and Q channels including the power control bits.

26. A code division multiple access subscriber unit in accordance with claim 22, wherein the circuitry is further configured to generate a plurality of traffic channels;

wherein the second radio frequency signal including the I and Q components is derived from the plurality of traffic channels and at least two of the plurality of traffic channels have differing data rates.

27. A code division multiple access subscriber unit in accordance with claim 21, wherein the circuitry is further configured to generate pilot bits;

wherein the second radio frequency signal is derived at least in part from the pilot bits.